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Publication numberUS4092282 A
Publication typeGrant
Application numberUS 05/825,889
Publication dateMay 30, 1978
Filing dateAug 19, 1977
Priority dateMay 24, 1976
Publication number05825889, 825889, US 4092282 A, US 4092282A, US-A-4092282, US4092282 A, US4092282A
InventorsJohn E. Callan
Original AssigneeCities Service Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Butyl rubber, a plasticizing or tackifying resin, polyamide-alkaline earth metal hydroxide reaction product
US 4092282 A
Abstract
Hot melt sealant compositions having superior adhesive bonding properties comprise butyl rubber, plasticizing or tackifying resins, and a reacted mixture of an alkaline earth metal hydroxide and a solid polyamide resin having a high amine value.
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Claims(4)
What is claimed is:
1. A hot melt sealant composition comprising (A) a butyl rubber component, (B) a resin selected from the group consisting of plasticizing and tackifying resins, and (C) a reacted mixture of (1) about 25-100 phr of a solid polyamide resin having a molecular weight less than 10,000 and an amine value greater than about 50 and (2) an amount of an alkaline earth metal hydroxide selected from the group consisting of magnesium, calcium, strontium, and barium hydroxides such as to provide a polyamide/hydroxide weight ratio of about 10-20/l.
2. The composition of claim 1 wherein the butyl rubber component is a slightly crosslinked butyl rubber having a Mooney viscosity (ML 1+3 at 260 F.) of about 50-60.
3. The composition of claim 1 wherein the butyl rubber component is a blend of (A) a butyl rubber, (B) an ethylene-vinyl acetate copolymer, and (C) a thermoplastic segmented copolyester elastomer consisting essentially of about 15-30% by weight of ester units derived from butanediol and a phthalic acid and about 85-70% by weight of units derived from polytetramethylene ether glycol 1500-3500 and a phthalic acid, about 55-95% by weight of the phthalate units of the copolyester being terephthalate units.
4. The composition of claim 1 wherein the butyl rubber component is a blend of (A) a butyl rubber, (B) a styrene-ethylenebutylene-styrene block copolymer rubber, and (C) a thermoplastic segmented copolyester elastomer consisting essentially of about 15-30% by weight of ester units derived from butanediol and a phthalic acid and about 85-70% by weight of units derived from polytetramethylene ether glycol 1500-3500 and a phthalic acid, about 55-95% by weight of the phthalate units of the copolyester being terephthalate units.
Description
CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation-in-part of copending application Ser. No. 689,024, filed May 24, 1976, now abandoned.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to sealant compositions and more particularly relates to hot melt sealants based on butyl rubber.

2. Description of the Prior Art

It is known that sealants are useful in various appliance, automotive, and construction markets for sealing joints, such as masonry-metal, glass-metal, and glass-glass joints. Sealants such as asphalt, mastics, and putty have some utility in this regard, but they have the disadvantages of containing solvents, exhibiting creep and sag at various temperatures, shrinking with age, and having unacceptable moisture vapor transmission rates with poor environmental stability. Hot melt butyl sealants have been found preferable to other prior art sealants in many ways. However, even these hot melt butyl sealants have properties which could bear improvement.

SUMMARY OF THE INVENTION

An object of this invention is to provide novel hot melt butyl sealant compositions.

Another object is to provide such compositions having improved adhesive properties.

These and other objects are attained by the provision of a hot melt sealant composition comprising (A) a butyl rubber component, (B) a resin selected from the group consisting of plasticizing and tackifying resins, and (C) a reacted mixture of (1) an alkaline earth metal hydroxide selected from the group consisting of magnesium, calcium, strontium, and barium hydroxides and (2) a solid polyamide resin having a molecular weight less than 10,000 and an amine value greater than about 50.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The butyl rubber component of the invention may be an unmodified butyl rubber but is preferably a butyl rubber than has been modified by crosslinking and/or compounding with conventional sealant additives, such as other elastomers, elastomeric resins, crystalline resins, etc. It ordinarily comprises at least about 20% by weight of the butyl rubber and up to about 80% by weight of additives.

Particularly preferred butyl rubber components are (A) the slightly crosslinked butyl rubbers of U.S. Pat. No. 3,674,735, especially such rubbers having Mooney viscosities (ML 1+3 at 260 F.) of about 50-60, (B) a blend of (1) a butyl rubber, (2) an ethylenevinyl acetate copolymer, and (3) a block copolyester resin, and (C) a blend of (1) a butyl rubber, (2) a rubbery styrene-olefin block copolymer, such as a styrene-ethylene-butylene-styrene block copolymer rubber, and (3) a block copolyester resin.

When the butyl rubber component includes a block copolyester resin, this resin is suitably a thermoplastic segmented copolyester elastomer consisting essentially of about 15-30% by weight of ester units derived from butanediol and a phthalic acid and about 85-70% by weight of units derived from polytetramethylene ether glycol 1500-3500 (i.e., a polytetramethylene ether glycol having an average molecular weight of about 1500-3500) and a phthalic acid, about 55-95% by weight of the phthalate units of the copolyester being terephthalate units.

The resin constituting the second component of the composition of the invention may be any one or more of the plasticizing and tackifying resins conventionally employed in sealant compositions. However, it is usually a hydrocarbon resin, such as a polystyrene, a vinyltoluene-alpha-methylstyrene copolymer, a polyterpene, a polybutene, a polyisobutylene, etc.; a phenolic resin, such as a modified alkylphenol-formaldehyde resin, a thermoplastic terpene phenolic resin, etc.; a chlorinated bi- or polyphenyl; a coumarone-indene resin; natural rosin; a modified rosin, such as a glycerol ester of polymerized rosin, an ester of hydrogenated rosin, etc., and mixtures thereof. The concentration of this component is not critical but is ordinarily in the range of about 25-200 phr, i.e., about 25-200 parts per 100 parts of the butyl rubber component.

The polyamide-hydroxide reaction product which constitutes the crux of the invention is a reaction product of (1) about 25-100 phr of a solid polyamide resin having a molecular weight less than 10,000 and an amine value greater than about 50 and (2) an amount of an alkaline earth metal hydroxide selected from the group consisting of magnesium, calcium, strontium, and barium hydroxides such as to provide a polyamide/hydroxide weight ratio of about 10-20/l. The hydroxide used to prepare the reaction product may be a commercial or purer material.

The compositions of the invention are prepared by compounding the aforementioned components and any optical ingredients in any suitable manner, e.g., by mixing and heating the ingredients in a low shear mixer, such as a sigma blade mixer, at about 300-400 F. Ordinarily, the polyamide and alkaline earth metal hydroxide are reacted together prior to being admixed with the other ingredients, but they may be mixed separately with the other ingredients and allowed to react with one another under the mixing conditions.

Optional ingredients which may be incorporated into the compositions include the additives conventionally employed in sealant compositions, e.g., crystalline resins, elastomeric resins, inert fillers, etc. Particularly preferred additives are those that act as adhesion promoters, e.g., high or low amine content polyamide resins; rubbery styrene-olefin block copolymer rubbers, such as the block copolymer rubbers sometimes used as ingredients of the butyl rubber component; block copolyesters, such as those sometimes used as ingredients of the butyl rubber component, etc., and those that are inert fillers, e.g., carbon black, calcium carbonate, talc, titanium dioxide, diatomaceous earth, etc. Any combination of such ingredients may be used to achieve a desired effect.

The compositions of the invention may be used immediately or may be stored for later application with commercial hot melt sealant applicators.

The compositions of the invention are advantageous in that they are solvent-free, minimum-shrinkage sealants having excellent creep and/or sag properties, are easily applied, and have excellent moisture vapor transmission rates, good adhesion and tensile properties, and minimum tack at room temperature. A typical composition has a moisture vapor transmission rate of about 0.1 g/M2 /24 hours, an initial peel value greater than 20 lbs./in. at room temperature, and a three-week, 100%-relative-humidity, 150 F. peel value greater than 10 lbs./in. at room temperature.

The following examples are given to illustrate the invention and are not intended as a limitation thereof. Unless otherwise specified, parts mentioned are parts by weight. Peel adhesion results given in the example are measures of the adhesion to glass, are obtained in accordance with Canadian Standard 19-GP-3a, paragraph 7. 3. 7, and show whether the type of failure obtained is "a" (the undesirable adhesive failure) or the more desirable "c" (cohesive failure) or "f" (film failure).

In the Examples, compositions of the invention are prepared by (1) mixing the alkaline earth metal hydroxide with the high amine content polyamide in a sigma blade mixer at about 350 F. for 20 minutes, (2) simultaneously mixing the butyl rubber component with 50% of the total amount of other ingredients in another sigma blade mixer at about 350 F. for about 10-20 minutes, (3) adding the remainder of the ingredients to the second mixer and mixing for about 5 minutes, (4) adding half of the polyamide-hydroxide reaction product to the second mixer and mixing for 20 minutes, (5) adding the remainder of the polyamide-hydroxide reaction product, and (6) continuing mixing until the total mixing time is 60 minutes. Compositions in which a polyamide-hydroxide reaction product is not used are prepared similarly except that the first sigma blade mixer is not employed.

EXAMPLE I

Prepare a hot melt sealant composition from the following recipe:

______________________________________Ingredient                Parts______________________________________Butyl rubber component*   100Block copolyester resin**  75Terpene phenolic resin     30Polyisobutylene tackifying resin                     100______________________________________ Reaction product of 5/100 mixture of calcium hydroxide and a solid polyamide resin having a molecular weight less than 10,000 and an amine value greater than about 50 *A mixture of (A) 85-125 parts of a butyl rubber having a Mooney viscosit (ML 1 + 3 at 260 F.) of 50-60, (B) 20-35 parts of the block copolyester resin defined below, (c) 25-50 parts of an ethylene-vinyl acetate copolymer, (D) 25-35 parts of diatomaceous earth, and (E) 3-7 parts of rutile grade titanium dioxide **A thermoplastic segmented copolyester elastomer consisting essentially of about 15-30% by weight of ester units derived from butanediol and a phthalic acid and about 85-70% by weight of units derived from polytetramethylene ether glycol 1500-3500 and a phthalic acid, about 55-95% by weight of the phthalate units of the copolyester being terephthalate units

The composition has a normal peel adhesion to glass of 25 lbs./in. (f) at 75 F. and 9 lbs.in. (f) at 150 F. After aging for three weeks at 150 F. and 100% relative humidity, it has a peel adhesion of 31 lbs./in. (c) at 75 F.

EXAMPLE II - CONTROL

Repeat Example I except for replacing the polyamidehydroxide reaction product with 30 parts of unreacted solid polyamide resin having a molecular weight less than 10,000 and an amine value greater than about 50. The composition has a normal peel adhesion to glass of 14 lbs./in. (f) at 75 F. and 6 lbs./in. (f) at 150 F. After aging for three weeks at 150 F. and 100% relative humidity, it has a peel adhesion of 22 lbs./in. (a) at 75 F.

EXAMPLE III

Prepare a hot melt sealant composition from the following recipe:

______________________________________Ingredient                Parts______________________________________Butyl rubber component*   100Terpene phenolic resin    50Polyamide having an amine value lessthan about 50             50Polyamide-hydroxide reaction productof Example I              50______________________________________ *A mixture of (A) 80-110 parts of a butyl rubber having a Mooney viscosit (ML 1 + 3 at 260 F.) of 50-60, (B) 35-60 parts of a styrene-ethylene-butylene-styrene block copolymer rubber, (C) 35-60 parts of the block copolyester resin of Example I, (D) 25-35 parts of diatomaceous earth, and (E) 3-7 parts of rutile grade titanium dioxide

The composition has a normal peel adhesion to glass of 68 lbs./in. (c) at 75 F. and 64 lbs./in. (c) at 150 F. After aging for three weeks at 150 F. and 100% relative humidity, it has a peel adhesion of 17 lbs./in. (c) at 75 F.

EXAMPLE IV - CONTROL

Repeat Example III except for replacing the polyamidehydroxide reaction product with 50 parts of unreacted solid polyamide resin having a molecular weight less than 10,000 and an amine value greater than about 50. The composition has a normal peel adhesion to glass of 76 lbs./in. (c) at 75 F. and 37 lbs./in. (c) at 150 F. After aging for three weeks at 150 F. and 100% relative humidity, it has a peel adhesion of 8 lbs./in. (a) at 75 F.

EXAMPLE V

Prepare three hot melt sealant compositions from the following recipe:

______________________________________Ingredient                Parts______________________________________Slightly crosslinked butyl rubber havinga Mooney viscosity (ML 1 + 3 at 260 F.)of about 50-60            100Terpene phenolic resin    100Block copolyester resin of Example I                     100Solid polyamide resin having amolecular weight less than 10,000 andan amine value greater than about 50                     100-110______________________________________

In the first composition, a control composition, the polyamide is 100 parts of unreacted resin; in the second and third compositions, it is the reaction product of 100 parts of the resin with, respectively, 5 and 10 parts of calcium hydroxide.

The compositions have respective normal peel adhesions to glass of 67 lbs./in. (f), 68 lbs./in. (f), and 80 lbs./in. (f) at 75 F. and 35 lbs./in. (c), 36 lbs./in. (c), and 32 lbs./in. (c) at 150 F. After aging for three weeks at 150 F. and 100% relative humidity, they have respective peel adhesions of 0 lb./in. (a), 42 lbs./in. (f), and 23 lbs./in. (c) at 75 F.

EXAMPLE VI

Prepare a hot melt sealant composition from the following recipe:

______________________________________Ingredient                Parts______________________________________Slightly crosslinked butyl rubber havinga Mooney viscosity (ML 1 + 3 at 260 F.)of about 50-60            85Styrene-ethylene-butylene-styreneblock copolymer rubber    60Block copolyester resin of Example I                     60Diatomaceous earth        25Terpene phenolic resin    120Polyamide resin having an amine valueless than about 50        120Rutile grade titanium dioxide                      5______________________________________

After aging for three weeks at 150 F. and 100% relative humidity, the composition has a peel adhesion to glass of 25.7 lbs./in. (f) at 75 F.

EXAMPLE VII

Repeat Example VI except for replacing the polyamidecalcium hydroxide reaction product with a reaction product of a 5/100 mixture of magnesium hydroxide and a solid polyamide resin having a molecular weight less than 10,000 and an amine value greater than about 50. After aging for three weeks at 150 F. and 100% relative humidity, the composition has a peel adhesion to glass of 41.7 lbs./in. (c) at 75 F.

Similar results are observed when the ingredients of the Examples are replaced by ingredients taught to be their equivalents in the specification.

It is obvious that many variations may be made in the products and processes set forth above without departing from the spirit and scope of this invention.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2570895 *Dec 1, 1947Oct 9, 1951Goodrich Co B FRubber to fabric adhesion with mixture of latex and polyamine-polyacid condensation product adhesive
US3674735 *Dec 22, 1969Jul 4, 1972Cities Service CoSemi-vulcanized butyl rubber for sealant applications
US3846370 *Jun 7, 1973Nov 5, 1974Shatterproof Glass CorpSealing element and composition
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4217435 *Aug 28, 1978Aug 12, 1980Eastman Kodak CompanyAdhesive composition
US5169890 *Oct 11, 1991Dec 8, 1992Ciba-Geigy CorporationThermoplastic hot melt adhesive
US7271209Feb 19, 2004Sep 18, 2007Exxonmobil Chemical Patents Inc.Using simple nonfunctionalized hydrocarbon; low and high temperature applications; impact strength, toughness, flexibility; food containers, diapers, clothing, toys
US7531594Feb 19, 2004May 12, 2009Exxonmobil Chemical Patents Inc.Polyolefin, particularly a propylene polymer, and one or more non-functionalized plasticizers having a kinematic viscosity ("KV") of 2 cSt or less at 100 degrees C., such as paraffins, isoparaffins or olefin oligomers
US7619026Aug 12, 2003Nov 17, 2009Exxonmobil Chemical Patents Inc.Mixture with hydrocarbon
US7622523Feb 9, 2005Nov 24, 2009Exxonmobil Chemical Patents Inc.sterilized article comprising a plasticized polyolefin composition comprising one or more polyolefins and one of more non-functionalized plasticizers
US7632887Aug 4, 2003Dec 15, 2009Exxonmobil Chemical Patents Inc.Plasticized polyolefin compositions
US7875670Feb 25, 2009Jan 25, 2011Exxonmobil Chemical Patents Inc.Articles from plasticized polyolefin compositions
US7985801Sep 13, 2007Jul 26, 2011Exxonmobil Chemical Patents Inc.polypropylene or polybutene and paraffinic hydrocarbon plasticizer having a number average molecular weight of 500 to 20,000; improve impact strength and toughness at low and high temperatures; nonbrittle; food containers, diapers, clothing, surgical gown
US7998579Apr 29, 2005Aug 16, 2011Exxonmobil Chemical Patents Inc.Polypropylene based fibers and nonwovens
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US8211968Jan 25, 2010Jul 3, 2012Exxonmobil Chemical Patents Inc.Plasticized polyolefin compositions
US8217112Oct 19, 2009Jul 10, 2012Exxonmobil Chemical Patents Inc.Plasticized polyolefin compositions
US8377528 *Jul 22, 2005Feb 19, 2013Cryovac, Inc.Additive delivery laminate, process for making and using same and article employing same
US8389615Jul 7, 2006Mar 5, 2013Exxonmobil Chemical Patents Inc.Elastomeric compositions comprising vinylaromatic block copolymer, polypropylene, plastomer, and low molecular weight polyolefin
US8513347Jul 7, 2006Aug 20, 2013Exxonmobil Chemical Patents Inc.Elastomeric compositions
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CN101981117BMar 24, 2009May 1, 2013爱克工业株式会社Hot-melt composition, sealing material, and solar battery
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Classifications
U.S. Classification524/271
International ClassificationC09J123/22
Cooperative ClassificationC09J123/22
European ClassificationC09J123/22
Legal Events
DateCodeEventDescription
May 10, 1982ASAssignment
Owner name: HARDMAN INCORPORATED; 600 CORTLANDS ST., BELLEVILL
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:COLUMBIAN CHEMICALS COMPANY;REEL/FRAME:003989/0980
Effective date: 19820416